[GHC] #12536: Clarify commentary surrounding unboxed tuples and kind invariant

[GHC]

#12536: Clarify commentary surrounding unboxed tuples and kind invariant
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           Reporter:  bgamari        |             Owner:  simonpj
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 ticket:12115#comment:8 notes that there are a few inconsistencies in the
 comments describing these areas. Simon, could you have a look?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12536>
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